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《Journal of Glaciology and Geocryology》 2007-06
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Numerical Analysis of Coupled Moisture and Heat Transfer within a Freezing Aeolian Sandy Embankment in Seasonally Frozen Soil Regions

SONG Cun-niu1,2,WANG Xuan-cang2(1.College of Science,Chang′an University,Xi′an Shaanxi 710064,China;2.Highway college,Chang′an University,Xi′an Shaanxi 710064,China)  
Based on Harlan model and Darcy law,in this paper,a mathematical model is established of coupled moisture and heat transfer within an aeolian sandy embankment during freezing period,which wholly depends on meteorological data and parameters of moisture and heat,considering the temperature gradient that influences moisture transfer,temperature and water content that influences moisture and thermal parameters,effects of meteorological-environmental factors.On the basis of the model validation,a numerical simulation is made for the moisture and heat transfer at K135+000 of National Highway No.207,a section of desert road,in Xilin Hot of Inner Mongolia during freezing period,by means of total implicit finite difference scheme and TDMA iterative method.The simulation shows that the road frozen depth is approximately linear variation with time,the frozen speed is 2~3 m·d-1,the frozen depth is about 3 m,the frost time is about 180 days;and that moisture transfer mainly takes place in the frozen fringe,moisture moves from unfrozen area to frozen area,water content decreases 25%~30% beneath the frozen fringe and water transfer increases gradually with movement forward of the frozen fringe;and that the maximum water content variation is at the bottom of the maximum frozen depth,while temperature varies extremely in 0~50 cm of the pavement depth and the difference between the highest and the lowest temperatures is 30.5 ℃,24.5 ℃,18.9 ℃ in 0 cm,20 cm,50 cm depths within the pavement in all time of the freezing and thawing period.
【Fund】: 西部交通建设科技项目(2001-318-772-05);; 长安大学科技发展基金项目(0305-1001)资助
【CateGory Index】: U416.168
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